摘要
将银纳米粒子制备成可打印的墨水,采用喷墨打印方法将此墨水打印在纸张表面,作为柔性表面增强拉曼散射基底。重点研究了不同银墨水倍数和不同打印层数对拉曼检测灵敏度的影响。实验结果表明,以55 mmol/L浓度银墨水作为打印原料,在打印7层时,基底对罗丹明(R6G)分子的检测浓度低于10^(-10)mol/L,最大增强因子约为1.92×10^(9),相对误差分析计算结果为14.3%。同时,在苹果的曲面上对该基底的拉曼增强效果进行了实际检测。最后,结合基底的扫描电子显微镜(SEM)结果,采用有限时域差分(FDTD)软件对该基底的电磁场增强特性进行了计算。
Objective Surface enhanced Raman scattering(SERS)is a multifunctional detection technology widely used in chemical and biological molecules.It has the advantages of high detection sensitivity,no sample treatment,nondestructive testing,etc.SERS technology can realize ultra-low concentration molecular detection or even single molecule detection.As a flexible substrate material,paper is different from the traditional rigid substrate.The rigid substrate is fragile,which greatly limits the application of plasma nanostructures.The flexible substrate can be easily cut into different shapes and sizes to meet the needs of non-planar,flexible,and other applications.At the same time,as paper has the characteristics of easy access and low cost,there are many explorations in the preparation of paper-based SERS substrates,and there are various preparation methods for paper-based SERS substrates,such as pen on paper,spray preparation,and other preparation methods.However,the preparation process of these paper-based SERS substrates is relatively cumbersome,and it is difficult to meet the different pattern design requirements under different environmental conditions.In this paper,the Ag-paper-based SERS substrate is prepared by inkjet printing,and the high-performance paper-based SERS substrate is prepared by selecting the optimal parameters.Methods In this study,an Ag-paper-based SERS substrate is prepared by inkjet printing on hydrophobic A4 paper.Firstly,a brown-green silver sol solution with an average particle size of 58.6 nm is prepared by the Lee preparation method,and the parameters of silver nitrate,sodium citrate,and heating time are set.Silver ink is prepared as follows.Silver sol is centrifuged and ultrasonically operated,the supernatant is removed,and the silver sol washing process is repeated twice.According to the silver sol concentration multiples of 10,20,33,and 50,supernatants of 50,53,54,and 55 mL on the surface are removed,respectively.The absolute ethanol and glycerin are added according to the configuration
作者
汤智谋
孙宁
张洁
Tang Zhimou;Sun Ning;Zhang Jie(Key Laboratory of Optoelectronic Technology and Systems(Chongqing University),Ministry of Education,Chongqing 400044,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第9期242-249,共8页
Acta Optica Sinica
基金
国家自然科学基金(62175023,61875024)
重庆市杰出青年基金(cstc2019jcyjjqX0018)。
关键词
散射
拉曼散射
喷墨打印
银/纸张复合结构
表面增强拉曼散射
scattering
Raman scattering
inkjet printing
silver/paper composite structure
surface enhanced Raman scattering
